Abrading tool



March 2, 19370 F. HICKS ET AL 3 9 ABRADING TOOL Filed Dec. 4, 1934Patented Mar. 2, 1937 UNITED STATES ABRADING TOOL Fred Ricks and ErnestHope, Leicester, England,

assignors to United Shoe tion, Paterson, N. J., Jersey ApplicationDecember 4, In Great Britain 2 Claims.

This invention relates to abrading tools and is herein disclosed asembodied in a disk type of tool such as is used in bufilng the shank andheel breast surfaces of shoes. In United States Letters Patent No.2,025,125, granted December 24, 1935 upon our application, we discloseda disk type of tool the abrasive element of which consists of a strip ofabrasive sheet material molded to conform to the peripheral portion ofthe tool in body. The abrasive element of the tool disclosed in thepresent application is similarly molded to conform to the periphery ofthe tool body. In tools of this type, wherein only the marginal portionof the tool is used, a considerable saving of i5 abrasive materialresults from employing a strip of abrasive material rather than a largesheet which covers the entire face of the tool.

It is an object of the present invention to provide an improved abradingtool of the character 20 under consideration. In accordance with afeature of the invention, an inflatable ring is mounted upon the rim ofa wheel-like member having a hub which is adapted for attachment to arotary spindle, and a clamping disk is provided 25 which has a hubfitting over the hub of the wheel-like structure, to clamp a dove-tailannular tongue extending from the inflatable ring against the rim of thewheel-like structure.

With the above and other objects and features 30 in view, the inventionwill now be described with reference to the accompanying drawing, andpointed out in the claims.

In the drawing,

Fig. 1 is an elevational View partly in section 35 of the improved toolin operation upon the breast surface of a shoe heel;

Fig. 2 is a bottom plan view of the tool shown in Fig. 1;

Fig. 3 is a view in radial section (drawn to a 40 larger scale) of theperipheral portion of the tool shown in Fig. 1,-

Fig. 4 is a view similar to Fig. 3 but showing a modification;

Fig. 5 is a plan view of a piece of woven abra- 45 sive sheet materialillustrating the direction in which a strip is cut to form an abrasiveelement therefrom;

Fig. 6 is an elevational view of a molding device; and

Fig. 7 is a view in perspective of a molded abrasive element ready forapplication to a tool such as is shown in Fig. 1.

Referring to Fig. 1, the illustrated tool is supported upon the taperedend portion of a tubular 55 spindle I III which is driven by anysuitable means.

Machinery Corporaa corporation of New 1934, Serial No. 755,962 February6, 1934 The tool comprises a body portion in the form of a. wheel I03which is conveniently made of aluminum and which has a hub I05 in whichis formed a socket for receiving the end of the spindle WI. The toolbody I 03 is of general discoidal form, but its central portion issomewhat convex toward the spindle I III. Slidably'fitting over the hubI05 is a hub of a clamping member ill! of substantially the samediameter as the tool body I03. The periphery of the tool body I03 isrecessed, and the tool body I03 and the clamping member I07 have flangesI09 and II! respectively formed thereon. A nut I I3 is threaded upon thehub I05 in abutting relation to the hub of the clamping member I01.

Mounted upon the periphery of the tool body I03 is an inflatable tubularring N5 of rubber. The form of this ring in radial section is shown inFig. 3. At the base of the ring there extends inwardly a dove-tailtongue III, so shaped as to be firmly gripped between the shoulders I09and III. The spindle IIII has an axial passageway III! which at itsupper end is connected with any suitable source of air under pressure. Asmall tube I 2| opens at one end into the socket of the hub I05 and atits other end extends slightly beyond the surface of the recessedperipheral portion of the tool body I03. When the inflatable ring II5 isassembled in position upon the tool body, a small opening through thetongue III of the ring registers with the projecting end of the tube I2Ito form an air-tight joint. The ring H5 is provided with an annular airchamber I23 which communicates with the above-mentioned opening in thetongue II'I. Air under pressure will thus pass from the passageway II9into the socket of the hub I05, thence through the tube I 2| and theopening in the tongue II'I into the air chamber I23 to inflate the ringII5. As is shown in'Fig. 3, the wall of the air chamber I23 is thinnerat the peripheral portion of the ring than at its sides, in order thatwhen air under pressure is introduced into the ring the expansion of thering will take place diametrically rather than transversely. The ringII5 may conveniently be made by vulcanizing together two suitable piecesof rubber in a mold and, as shown in Fig. 3 a strip I25 of stoutnon-elastic fabric such as canvas may be introduced at the joint at thebase to strengthen the ring and to prevent diametrical expansion of thetongue portion of the ring. The lines I26 (Figs. 3 and 4) represent thejunction of the two pieces of rubber prior to vulcanization; aftervulcanization the two pieces of rubber are united to form an integralring.

As shown in Figs 1 and 2, the abrasive element of the tool consists ofan annular cover I21 of abrasive sheet material. This cover, beforeapplication to the tool, is shown in Fig. 7. The cover I21 has aninherent shape which is similar to that of the periphery of the ring H5.This shape may conveniently be obtained by a molding operation whichwill later be described. The cover is applied to the tool when the ringH5 is in deflated condition, an overlapping end of the cover beingcemented to an underlapping end. As shown at I49 in Figure 7, theabrasive material is removed from the cover at the joint to avoid unduethickness of the joint. With the abrasive cover it? thus applied to thering H5, inflation of the ring will cause the ring to expanddiametrically and thereby hold the cover I21 firmly place. It will beevident that not only the peripheral marginal portion H29 of the coveri2! is available for buffing or scouring, but also the portions lti ofthe cover adjacent to the periphery at each side thereof. These surfacesl3i are inclined at a substantial angle to the axis of rotation of thetool.

The external diameter of the illustrated tool is substantially sixinches. In Fig. 1 the tool is shown in operation upon a breast surfaceof a shoe S having a heel it will be noted that by reason of therelatively large diameter of the tool, ample clearance is provided forthe spindle and for the hub oi the tool.

In the shoe S, as shown in Fig. i, the locality of the shoe bottom atthe junction between the shanl: and the heel breast surface has asubstantiaii radius of curvature and there is no difficulty in bringingthe scouring surface or the above-described tool to bear properly uponit. In the case of shoes wherein there is a sharp angle between the heelbreast surface and the shank. it is convenient to employ a tool. havingan infiatable ring such as is shown in Fig. 4 which is more sharplywedge-shaped at its periphery to enable the abrasive element to operateupon such angular portion of the shoe.

The abrasive cover 82? is conveniently formed from a strip of wovenabrasive sheet material which, as illustrated in Fig. 5, is out on thebias from a large sheet The direction of the weave of the material isindicated at it? in Fig. 3. A strip i3?) is shown as having been cut atan angle of about 30 After the strip i139 has been cut, it is wellmoistened to soften it and is then molded upon a forming member Ml. Asshown in Fig. 6, the forming member Ml comprises a wooden cylinderhaving a helical projection M3 in the nature of a large screw threadformed therearound. One

to the weave of the fabric.

end of the damp strip H9 is secured to the helical portion M8 by anysuitable means such as a pin I45, whereupon the strip is wrapped aroundthe helical projection under tension, the strip being pulled in a moreor less tangential direction, as indicated by the arrow Ml. Under theinfluence of this tension the strip will conform itself to the surfaceof the helical projection. When a sufilcient length of the strip hasthus been wrapped along the projection the free end of the strip issecured in place by another pin and the strip is left to dry upon theformer. When the band is dry and removed from the former, it will befound to be in such firmly molded condition that it retains its moldedshape satisfactorily under ordinary conditions of use. The externaldiameter of the forming member ifill is preferably somewhat less indiameter than the cover it? when in use. The efiective opening out ofthe molded strip to a somewhat larger diameter tends to increase to someextent the sharpness of the angle between the side portions till or thestrip and thus tends to cause the strip to grip the rim of theinflatable ring lib. In using a helical forming member of the type abovedescribed, any desired length oi strip can be molded in a singleoperation.

A further improvement upon abrading tools of the type above described isdisclosed and claimed in the application for Letters Patent of theUnited States Serial No. Z55,972, filed December a, 193% in the name oiWilliam Roderick harclay.

Having described the invention, what is claimed as new and desired to besecured by Letters Patent oi the United States is:

3.. An abrading tool comprising a wheel having a hub adapted forattachment to a rotary spindle, an inflatable tubular ring mounted uponthe rim oi said wheel for carrying an. abrasive cover, a clamping dislhaving a hub which fits over the hub of said wheel, said inflatable ringhaving an inwardly extending annular dove-tail adapted to be clampedbetween he rim of said wheel and the peripheral portion o3 said clampingdislr, and means for retaining said clamping dlslr in clamping position.

2. An abrading tool comprising a rotary tool body, an elastic tubularring mounted on said tool body, said ring having within it an annularair chamber, said ring having also an annular inwardly extending tongue,means engageable with said tongue for securing said ring to said toolbody, and a non-elastic reinforcing member secured within said tongue toprevent diametrical expansion of the tongue portion of the ring when thering is inflated.

